SIGs (Special Interest Groups)
A SIG is an independent, not-for-profit, membership group organized to provide a forum for the exchange and collection of railroad prototype and/or model railroad information about specific topics. It differs from other NMRA groups as generally the SIG has no geographical boundary and as such is not associated with a particular Division of NMRA BR.

Forum rules
SIGs (Special Interest Groups)
A SIG is an independent, not-for-profit, membership group organized to provide a forum for the exchange and collection of railroad prototype and/or model railroad information about specific topics. It differs from other NMRA groups as generally the SIG has no geographical boundary and as such is not associated with a particular Division of NMRA BR.

A SIG should have a coordinator (who is an NMRA member) who can provide an annual report to the BOD for the Directory and maintain up to date contact details and reports etc in Roundhouse and on the Region website. The Region Secretary will maintain an upto date list of SIGs